{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["RNA", "cell type", "DNA", "protein", "cell line"], "input": "In directing the synthesis of RNA through the intervening DNA and the gene by a tracking and transcription mechanism , the HS2 enhancer may (i) open up the chromatin structure of a gene domain and (ii) deliver enhancer binding proteins to the promoter sequence where they may stimulate the transcription of the gene at the cap site ."}
{"RNA": ["RNA"], "cell type": [], "DNA": ["DNA", "HS2 enhancer", "enhancer", "chromatin structure", "gene domain", "cap site"], "protein": ["enhancer binding proteins"], "cell line": []}